| 摘要 |
PURPOSE:To prevent splashing of molten metal and slag during refining in the stage of decarburizing and refining a stainless steel, etc. in an AOD type converter by providing tuyeres for blowing a gaseous mixture composed of O2 and Ar at different levels in a horizontal direction. CONSTITUTION:Tuyeres 10a, 10b, 10c for blowing a gaseous mixture composed of O2 and Ar are disposed at different levels in the stage of decarburizing and refining a molten stainless steel in an AOD type converter. More specifically, the tuyeres 10a, 10c are provided at the same level at theta2=60 deg. space toward the central direction of the furnace inside and the tuyere 10b is provided in the intermediate position (theta3=30 deg.) at the plane of 10a and 10c in the position upper than 10a, 10c. A gaseous mixture composed of O2+Ar is blown through the tuyere 10b with the ejecting force smaller than the ejecting force of the gas from the tuyeres 10a, 10c during refining, by which the splashing owing to the build-up of the molten steel 31 and molten slag 32 in the furnace is obviated and the consequent damage of refractories 25, 27 in the furnace is decreased. |
